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Re:Some Differences Between macOS and Common Unix Systems by tyingq on Friday December 25, 2020 @10:45AM (#25537065)
Some specific pieces of C++ support that Clang is missing:

Edit: newer link: https://clang.llvm.org/cxx_status.html

(older link, not applicable, was here)

Cross compiling for some embedded architectures.

Things like FORTRAN or Ada, calling routines built there from C (or vice versa), etc.

Re:Some Differences Between macOS and Common Unix Systems by jeffbee on Friday December 25, 2020 @10:49AM (#25537085)
I don't know where you dug that up. That doc must be at least 10 years old. The clang that you get on an actual mac these days fully supports everything through C++17.
Re:Some Differences Between macOS and Common Unix Systems by tyingq on Friday December 25, 2020 @10:53AM (#25537112)
Thanks. Updated with a current link.